170 



8. Stem erect ... ... ... ... 9. 



Stem twining ... ... ... ... 10. 



9. Petals reflexed, stamens raised on a 



short tube .. . ... ... ... 3. Asclepias. 



Petals spreading, stamens sessile ... 6. Cynanchum. 



10. Corona ... ... ... ... 4. Gymnevia. 



Corona of 5 scales ... ... ... 11. 



11. Corolla narrow-campanulate ... ... 9. Marsdenia. 



Corolla rotate ... ... ... ... 6. Cynanchum, etc. 



1.— GRYPTOLEPIS. 



1. C. elegans, Wall. ; Hook, f. Fl. Brit. Ind. iv. 6. Lantao 

 Island and Shatin Road, Hongkong New Territory ; 

 French Island, Whampoa ; along the Canton River ; 

 White Cloud hiUs, near Canton ; West River. Fl. 

 yellow, June. 



2.— TOXOGARPUS. 



1. T. Wightianus, Hook, et Am. ; Benth. Fl. Hongk. 224. Happy 

 Valley and West Point, Hongkong ; Lantao Island, 

 Maonshan and Hahang, Hongkong New Territory ; 

 Macao ; Pakhoi. Fl. yellow, June. 



3.— ASCLEPIAS. 



1. A curassavica, Linn. ; Benth. Fl. Hongk. 225. At Aberdeen 

 Taitam Tuk and other villages, Hongkong ; hills neai 

 Chaochaufu. Fl. orange-red. May to December. 



4.— GYMNEMA. 



1. G. affine, Decne. ; Benth. Fl. Hongk. 227. At Little Hong- 

 kong, Hongkong ; Macao ; Sanning ; Pakhoi. Fl. white 

 July. 



5.— GRAPHISTEMMA. 



1. G. pictum, Benth. et Hook. f. ; Holostemma pictum. Champ. 

 Benth. Fl. Hongk. 224. In ravines of Mt. Victoria, h 

 the Happy Valley and in the Pokfulam ravine, Hong 

 kong. Fl. purple and yellow, June. 



6.— CYNANCHUM. 



Key to species of Graphistemma (iSo. 5), Cijnanchini (No. 6) 

 Tijloplwra (No. 8), Dregea (No. 11). 



1. Inflorescence pedunculate ... ... 2. 



Inflorescence sessile 1. Cynanchum 



(itratum. 



2. Leaves deeply cordate, ovate, acuminate 3. 

 Leaves narrowed, rounded or subcordate 



below ... ... ... ... n 



